1 Features 2 Applications
1• I
2C to Parallel Port Expander • Servers
• Operating Power-Supply Voltage Range of 1.65 V • Routers (Telecom Switching Equipment)
to 5.5 V • Personal Computers
• Allows Bidirectional Voltage-Level Translation and • Personal Electronics (Gaming Consoles)
GPIO Expansion Between 1.8-V, 2.5-V, 3.3-V, • Industrial Automation
and 5-V I
2C Bus and P-Ports
• Products With GPIO-Limited Processors
• Low Standby Current Consumption of 1 μA
• 5-V Tolerant I/O Ports 3 Description
• 400-kHz Fast I
2C Bus The TCA6408A is a 16-pin device that provides 8-bits
of general purpose parallel input/output (I/O) • Hardware Address Pin Allows Two TCA6408A
expansion for the two-line bidirectional I
2
Devices C bus (or on the Same I
2C/SMBus Bus
SMBus) protocol. This device can operate with a
• Active-Low Reset (RESET) Input power supply voltage ranging from 1.65 V to 5.5 V on
• Open-Drain Active-Low Interrupt (INT) Output both the I
2C bus side (VCCI) and on the P-port side
• Input/Output Configuration Register (VCCP). This allows the TCA6408A to interface with
next-generation microprocessors and microcontrollers
• Polarity Inversion Register
on the SDA/SCL side, where supply levels are
• Internal Power-On Reset dropping down to conserve power. In contrast to the
• Power Up With All Channels Configured as Inputs dropping power supplies of microprocessors and
microcontrollers, some PCB components such as • No Glitch On Power Up
LEDs remain at a 5-V power supply.
• Noise Filter on SCL/SDA Inputs
The device supports both 100-kHz (Standard-mode) • Latched Outputs With High-Current Drive and 400-kHz (Fast-mode) clock frequencies. I/O Maximum Capability for Directly Driving LEDs expanders such as the TCA6408A provide a simple
• Latch-Up Performance Exceeds 100 mA Per solution when additional I/Os are needed for
JESD 78, Class II switches, sensors, push-buttons, LEDs, fans, and so
• Schmitt-Trigger Action Allows Slow forth. Input
Transition and Better Switching Noise Immunity at
Device Information(1)
the SCL and SDA Inputs
PART NUMBER PACKAGE BODY SIZE (NOM) • ESD Protection Exceeds JESD 22
TSSOP (16) 5.00 mm × 4.40 mm
– 2000-V Human Body Model (A114-A)
TCA6408A VQFN (16) 3.00 mm × 3.00 mm
– 1000-V Charged-Device Model (C101)
UQFN (16) 2.60 mm × 1.80 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.

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